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v3.21.1

Commitments and contingencies - Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Commitments and Contingencies [Roll Forward] |  |  |
Balance at beginning of period | $ 3,529 | $ 3,273 | $ 3,386
Provision for loan repurchases or indemnifications | 2,607 | 362 | 174
Recoveries on previous losses | (208) | (106) | 3
Losses on loans repurchased or indemnified | 0 | 0 | (290)
Balance at end of period | $ 5,928 | $ 3,529 | $ 3,273

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- Definition Allowance for loan repurchases or indemnifications. + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnifications
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance For Loan Repurchases Or Indemnifications, Losses On Loans Repurchased Or Indemnified + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnificationsLossesOnLoansRepurchasedOrIndemnified
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance for loan repurchases or indemnifications, recoveries on previous losses + References No definition available. + Details
Name: | fbk_AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Commitments and Contingencies [Roll Forward] + References No definition available. + Details
Name: | fbk_CommitmentsandContingenciesRollForward
Namespace Prefix: | fbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provision for mortgage loan repurchase or indemnifications. + References No definition available. + Details
Name: | fbk_ProvisionForMortgageLoanRepurchasesOrIndemnifications
Namespace Prefix: | fbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration